Built on

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2018

New Physics in the Rayleigh-Jeans Tail of the CMB

Pospelov, Maxim, Pradler, Josef, Ruderman, Joshua T. et al.

Understand

We show that despite stringent constraints on the shape of the main part of the CMB spectrum, there is considerable room for its modification within its Rayleigh-Jeans (RJ) end, $\omega \ll T_{\rm CMB}$.

We construct explicit New Physics models that give an order one (or larger) increase of photon count in the RJ tail, which can be tested by existing and upcoming experiments aiming to detect the cosmological 21 cm emission/absorption signal.
This class of models stipulates the decay of unstable particles to dark photons, $A'$, that have a small mass, $m_{A'} \sim 10^{-14} - 10^{-9}$ eV, non-vanishing mixing angle $\epsilon$ with electromagnetism, and energies much smaller than $T_{\rm CMB}$.
The non-thermal number density of dark photons can be many orders of magnitude above the number density of CMB photons, and even a small probability of $A'\to A$ oscillations, for values of as small as $\epsilon \sim 10^{-9}$, can significantly increase the number of RJ photons.

Built on

J. Bernstein, M. Ruderman, and G. Feinberg, Phys. Rev. 132
1963
Earlier work this paper cites.
B. Holdom, Phys. Lett. B166
1986
Earlier work this paper cites.
S. J. Parke, Proceedings, 23RD International Conference on High Energy Physics, JULY 16-23, 1986, Berkeley, CA , Phys. Rev. Lett. 57
1986
Earlier work this paper cites.
T.-K. Kuo and J. T. Pantaleone, Rev. Mod. Phys. 61
1989
Earlier work this paper cites.
G. Raffelt and A. Weiss, Astron. Astrophys. 264
1992
Earlier work this paper cites.
J. C. Mather et al. , Astrophys. J. 420
1994
Earlier work this paper cites.
S. T. Staggs, N. C. Jarosik, D. T. Wilkinson, and E. J. Wollack, Astrophysical Letters and Communications 32
1995
Earlier work this paper cites.
M. Bersanelli, G. F. Smoot, M. Bensadoun, G. de Amici, M. Limon, and S. Levin, Astrophysical Letters and Communications 32
1995
Earlier work this paper cites.
M. Haft, G. Raffelt, and A. Weiss, Astrophys. J. 425
1995
Earlier work this paper cites.
N. A. Bahcall, in 13th Jerusalem Winter School in Theoretical Physics: Formation of Structure in the Universe Jerusalem, Israel, 27 December 1995 - 5 January 1996 (1995) arXiv:astro-ph/9611148 [astro-ph]
1995
Earlier work this paper cites.
D. J. Fixsen, E. S. Cheng, J. M. Gales, J. C. Mather, R. A. Shafer, and E. L. Wright, Astrophys. J. 473
1996
Earlier work this paper cites.
M. Zaldarriaga, S. R. Furlanetto, and L. Hernquist, Astrophys. J. 608
2004
Earlier work this paper cites.
S. Furlanetto, S. P. Oh, and F. Briggs, Phys. Rept. 433
2006
Earlier work this paper cites.
A. Mirizzi, J. Redondo, and G. Sigl, JCAP 0903
Original
2009
Earlier work this paper cites.
D. J. Fixsen et al. , (2009), 10.1088/0004-637X/734/1/5 , arXiv:0901.0555 [astro-ph.CO]
Original
2009
Earlier work this paper cites.
J. Jaeckel and A. Ringwald, Ann. Rev. Nucl. Part. Sci. 60
Original
2010
Earlier work this paper cites.
A. E. Nelson and J. Scholtz, Phys. Rev. D84
Original
2011
Earlier work this paper cites.